Brake mechanism for typewriting machines



Jan. 6, 1931. H; A. FooTHoRAP Y 1,787,573

BRAKE MECHANISM FOR TYPEWRITING MACHINES Original Filed March 25, 1927 2 Sheets-Sheet l Jan. 6, 1931.

H. A. FooTHoRAP 1,787,573 BRAKE MECHANISM FOR T'YPEWRITING MACHINES 2 sheets-sheet 2 Original Filed March 25, 1927 takenv on the usual guide rolls,

ywill be understood.

Patented Jan. (i, 1931 UNITED sra HARRY a. roofrnoiaar, or nARarsBUae,

i FSkI-IER COMPANY, OF .NEW YORK, l'.

laatste s rnnnsvnvan'a, Assrenon lro ELLIOTT- Y., A coarona'rren or DELAWARE BRAKE MECHANISM ron TYrEWRrTineriacHmns Original application filed' March 25, 1927,.Sera1 No. 7 1929. ISerial My invention relates to billing machines and more particularly to improvements in carriage brake mechanism for such machines.

The particular obj ect of my invention is to provide a carriage brake mechanism of greater flexibility than the present brake mechanisms, particularly as regards edecting variations in braking pressure, to simplify the construction of such mechanisms, andk provide an organization of partsfwhich can be easily and inexpensively manufactured.

Other objects will appear during the course of the succeeding description.

ln the accompanying drawings:

Figure 1 is a view in rear elevation, of a line space carriage equipped With my improved brake mechanism,

Figure 2 is a similar, fragmentary View, on an enlarged scale, showing parts in section,

Figure 3 is a y transverse sectional vien7 the line 3--3y of Figure 2, and

Figure d is a transverse sectionalview taken on the line 44-4 of Figure 2.

In the illustrated embodiment of my invention the brake mechanism has been shown as part of the equipment of the line space frame of the Elliott-Fisher billing machine of commerce. For a detailed understanding of the relation of this frame to the machine attention is directed to my copending application Serial No. 178,349, filed March 25, 1927, noW Patent No. 1,719,176, dated July 2, 1929, of Which the present application is a division.

It is sufficient in the present instance to say that the line space frame designated 1 includes frame brackets 2 and suitable connecting bars one of Which is shown at 3. Sup-V porting rolls, as shown at 4:, fast upon a line space shaft 5, support the frame 1 upon side rails 6 forming part of the Well known structure of these machines for supporting a fia-t platen not shown. The numeral 4a designates the purpose of Which The line space shaft 5 has fast therein gears? meshing With racks 8 upon the siderails 6 and by means of Which the frame 1 is propelled. in a line space direction. rihe shaft 5 is driven to linespace the 178,349; Divided'andtns application led April V4:,v s No. 352,489. l

frame 1 by line spacing mechanism shown generally4 at 9`and in detail in my copending application lSerial No. 352,488, filed April 4- th,.1929.'y As Will be understood the line space frame 1 `supports upon the beforementioned connecting bars 3 the usual letter space carriage of the Elliott-Fisher machine, indicated at 10, and including printing mechanism not shown, all` of which being Well known in the art need no tvbe further described herein. It is usual in this type of machine to provide the line space frame With a brake, Which Asecurely retainsthe printing mechanism/in accurate printing position. This mechanism is associated with the brake release bail 11. operated by a brake release key on the carriage, through the medium of a bail operator 12 yasindicatedin Figurel of the drawings. i

ln accordance` With my present improvement the` brake includes a disc 13j pinned t0.

the shaft 5 and fixed to a second disc-14, havingaan elongated hub 15 threaded vto receive nuts 16 and17constituting a backing for a spring -spider 18, designed to urge labrake disc 19 into frictional engagement with .a rubber, fabric or other friction disc 2O interposed between the discs ltand 19.

lt is obviousthat .if the disc 19 isheld againstV rotation material frictional resistance Will be opposed by it tothe rotation of the shaft 5.` Therefore, mounted on the rear frame member is a rocking retarding member 21 having a Vtransverse slot 22 Which receives the edge of the disce19, butv is of -slightly greaterY Width than they thickness of the disc,- The stem of themember 21 has an annular portion 23 engaged lby a brake lever 24 connected at its opposite end by means of a link 25 with one arm I26 of the lever 27 fixed to thebrake releasing bail 11, Normally, the spring28, which retains the bail. in its elevated position serves to elevate the outer end of the lever'24f for the purpose of turning the retarding member 21 sufficiently to clamp and retard the disc 19. The link 25 is threaded to receive nuts 29 whereby the brake lever 24 andmember 21 may be adjusted to vary the clamping action of the latter on the disc 19. By manipulating the nuts 16 and 17 the frictional engagement between the brake disc 19 and friction disc 2O may also be varied as will l be clear. y

lt is thought that from the foregoing the construction of the improvements:effected by me Will be clearly understood, but reserve the right to effect such modii'ications of the illustrated structure as may come fairly Vwith` in the scope ofthe appended` claims.

What l' claim is:

Yl."l`he Vcombination with a line spacev 0i' a line space shaft, friction discs frame, rotatable with the shaft, and a rocking retarding member having a slot for the reception of the edgeV of one of the discs to'hold and release vsaid disc.

The combination vwith Va`V line `space fra1 ne, ofaV line space shaft, a friction mem- I ber fixed to the sliaft,.a second friction Vmember loose on the shaft, a spring urging one `of the friction members toward the, other, a rocking retarding member receiving the edge of one of the friction members, and means for rocking the retarding member to Vresist vthe movement of the engagedfriction meinber With the shaft. Y

3.' The combination With aV line space frame, of a line space shaft, a disc pinned to the shaft, a second disc fixed to the irst disc, and having an elongated hub, a third disc mounted on the hub, a friction disc linterposed between the second andthird discs, a spring urging the third discwtoWard the second disc, a rocking retarding member having a slot receiving the edge of the third disc), and Y means for operating the rocking imember'to holdor release the third disc.

' 4. The combination With aline Vspace frame, of a line space sha-ft, a disc on said shaft, a frockingretarding member having a slot receiving theV edge ofthe disc, means for `v operating the rocking retarding member to clamp or release the disc, andmeans foreffecting Vvariations in the clamping action of said retarding member. v

5.v The combination With ia line space frame, of a line space shaft, a friction disc fast on the shaft, a second friction disc loose onthe sha-ft, means for urging said discs into '..ffrictional engagement and including devices for Varying the degree of such engagement, a rocking retarding member having a slot receiving the edge of one of said discs, means for operating the retarding memberto clamp.V or release said disc, and means for effecting variations in the clampingaction of said re'- tarding member.

In te-stimony'vwhereof I have aiiixed my signature.

d HARRY A. FOOTHORAP. 

